feat: 0.3.0 release

[jsilva]

Describe your changes

This PR covers

• https://github.com/avast/wanna-ml/pull/104 - 0.3.0.a1
• https://github.com/avast/wanna-ml/pull/103 - 0.3.0.a1

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] If it is a core feature, I have added thorough tests.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.34520% with 103 lines in your changes are missing coverage. Please review.

Project coverage is 74.53%. Comparing base (b59a582) to head (9fb17b1).

Files	Patch %	Lines
src/wanna/core/services/tensorboard.py	31.57%	13 Missing :warning:
src/wanna/core/services/notebook.py	53.84%	12 Missing :warning:
src/wanna/core/services/managed_notebook.py	42.10%	11 Missing :warning:
src/wanna/core/deployment/vertex_jobs.py	0.00%	9 Missing :warning:
src/wanna/core/deployment/vertex_pipelines.py	50.00%	8 Missing :warning:
src/wanna/core/services/base.py	33.33%	8 Missing :warning:
src/wanna/core/services/docker.py	70.37%	8 Missing :warning:
src/wanna/core/services/jobs.py	68.00%	8 Missing :warning:
src/wanna/core/services/pipeline.py	81.48%	5 Missing :warning:
src/wanna/core/utils/validators.py	69.23%	4 Missing :warning:
... and 10 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #106 +/- ## ========================================== + Coverage 74.42% 74.53% +0.10% ========================================== Files 57 57 Lines 2839 2835 -4 ========================================== Hits 2113 2113 + Misses 726 722 -4 ```

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